主权项 |
1. A common mode filter, comprising:
a first signal coil spirally formed in a dielectric layer of a multilayer structure, and serially inserted and connected to a differential signal line of one polarity; a second signal coil spirally formed in the dielectric layer so as to be superimposed on the first signal coil in a thickness direction and so as to face the first signal coil interposing the dielectric layer, and serially inserted and connected to a differential signal line of the other polarity; a first control coil spirally formed in the dielectric layer so as to be sandwiched between the first and second signal coils interposing the dielectric layer, and wound in the same direction as the first signal coil, and configured to control magnetic coupling between the first and second signal coils; and a first embedded resistor formed in the dielectric layer and connected to at least one of an outer peripheral end or an inner peripheral end of the first control coil, thus forming a first feedback loop circuit via the first control coil and the first embedded resistor. |